Take it from a celiac (someone who MUST avoid all gluten, wheat, rye, spelt, oat, barley etc. foods and flours and ingredients) THERE IS NO SUBTITUTE FOR WHITE FLOUR.
White flour contains gluten and that's what makes it so special and so perfect for baking.
When I bake (rather when DBF bakes for me

) I use gluten-free all purpose flour, rice flour, almond meal, garfava flour (garbanzo bean and fava beans).
Gluten-free all purpose flour is generally lower in carbs than regular all-purpose flour, but you must add xanthan gum otherwise your cake/cookie/pie crust will not hold together. This is because most gluten-free flour mixes (I LOVE THE ONE BY BOB'S RED MILL) contain a mixture of flours including high-protein flours like garbanzo flour.
There's a difference in texture. But, here's the only cake that I was able to pass off without people realizing they weren't eating white flour:
Bob's Red Mill Chocolate Cake Recipe
Don't use soy flour: soy is bad for the thyroid.
There's a difference though. And baking, even with eliminating white flour, is probably not going to be too healthy.